I'm familiar with electronic field trips that are available through Passport to Knowledge, supported by NASA and the National Science Foundation. And I can't remember exactly how I learned about this particular one. It may have been that I worked from the event backwards because I was aware of the Mars Pathfinder Project and the Mars Global Surveyor. And so I may have had that in mind and then searched for it on the Internet, but both of them do come up on the PBS Web site as electronic field trips.
